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Question: RE: how to apply product to sum identities of trigonometric expression

Question:RE: how to apply product to sum identities of trigonometric expression

pik1432 245 Maple
simplification trig identity
September 01 2020
1

Dear all, 

Would you tell me a way to apply the identity relationship in Maple, to rewrite 'subexp' below to 'subexp2'?


 

> 

restart;
> 

subexp := M__a*sin(omega*t + alpha)*I__a*sin(omega*t + phi);

M__a*sin(omega*t+alpha)*I__a*sin(omega*t+phi)

 (1)
> 

subexp2 := M__a * I__a * (-1/2*(cos(2*omega*t + alpha + phi)-cos(alpha - phi)));

M__a*I__a*(-(1/2)*cos(2*omega*t+alpha+phi)+(1/2)*cos(alpha-phi))

 (2)
> 

is(subexp = subexp2);

true

 (3)
> 

 


 

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